<!DOCTYPE html>
<html>
<head>
  <script type="text/javascript" src="jquery-1.6.2.js"></script>
  <script type="text/javascript">
  	$(document).ready(function (){
  		alert($("#c").val());
  	});
  	
  </script>
</head>
<body>
  <div>
  <input type="checkbox" name="a" />
  <span>Mary</span>
</div>

<div>
  <input type="checkbox" name="b" />
  <span>lcm</span>

</div>
<div>
  <input type="checkbox" name="c" id="c" checked />

  <span>Peter</span>
</div>


</body>
</html>